<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<script>
  function f1(){
    console.log(1*9);
  }
  f1();
  function f2(name,age){
    console.log(name+","+age);
  }
  f2();
  function f3(x,y){
    return (x*y);
  }
  console.log(f3());

  let f4=new Function("a","b","console.log(a+','+b)");
  f4("name",9);
  let f5=new Function("a","b","return a*b")
  console.log(f5(1,200));
  function f6(){
    console.log("什么都没有")
  }
</script>
<input type="button" value="按一下试试" onclick="f6()">
</body>
</html>